Dissertation
Dissertation > Agricultural Sciences > Crop > Cereal crops > Wheat > Wheat

Difference in Development between Culm and Tiller Roots and Their Contribution to Grain Yield and Quality in Wheat (Triticum Aestivum L.)

Author SongXinXin
Tutor HeDeXian
School Henan Agricultural University
Course Crop Cultivation and Farming System
Keywords Wheat (Triticum aestivum L.) Culm nodal roots Tiller nodal roots Seminal roots Grain yield Grain quality
CLC S512.1
Type Master's thesis
Year 2011
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The studies were carried out in the Scientific and Educational Park of Henan Agricultural University in 2008~2010. Zhengmai 9023 was used as materials in 2008~2009, the morphological and physiological characteristics of culm nodal roots and tiller nodal roots in late growing period and their contributions to grain yield and quality were used. Zhengmai 9023 and Zhoumai 18 were used as materials in 2009~2010, and the contributions of primary roots in late growing period to dry matter accumulation and grain yield and quality were used. The main results are as follows:(1) Difference in morphological and physiological characteristics of culm nodal roots and tiller nodal roots in late growing period were made clear. The nodal roots, root volume, and dry root weight per plant and root-shoot ratio of culm nodal roots were less than those of tiller nodal roots. Root vigor of tiller nodal roots was significantly higher than that of culm nodal roots, while soluble sugar content of tiller nodal roots was lower than that of culm nodal roots. Total nitrogen content of tiller nodal roots was significantly higher than that of culm nodal roots, and the difference between of them was significant in late grain filling period.(2) Contributions of culm and tiller nodal roots to grain yield and quality were aslo made clear. Contributions of tiller nodal roots to ears per plant, 1000-grain weight and grain yield per plant were greater than those of culm nodal roots, repectively, while contributions of tiller nodal roots to kernels per spike were less than those of culm nodal roots. Compared with those in control (keeping intact roots), grain amylose content and amylose/amylopectin of CNR and TNR increased significantly, while grain protein content decreased significantly. The results indicated that proportion and physiological characteristics of culm nodal roots and tiller nodal roots could be adjusted to increase grain yield and improve grain quality in production practice.(3) Contributions of seminal roots in late growing period to dry matter accumulation and grain yield and quality were studied. The results showed that seminal roots play an importmant roal in dry matter accumulation and grain yield, but have relatively litter influence in grain starch quality. There were differences in effects between of different wheat cultivars with gluten types.(4) Relationships between culm and tiller nodal root traits and grain yield and its components in late growing period were clarified. The correlation analysis results showed that there was a very significant negative correlation between tiller nodal root number and grain yield. During Heading and anthesis, there was a very significant positive correlation between culm nodal root vigor and grain yield, there was a very significant negative correlation between tiller nodal root vigor and grain yield, and there was a significant negative correlation between total nitrogen content of tiller nodal roots and kernels per spike.

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